How to make my gf cum, when not on top?

I have a long distance relationship with my girlfriend and I only meet her 1s or 2ice a month for a weekend and we get right to it as soon as we get the chance :), SEX is beyond awesome for both of us, but she only cums when she's on Top. And that is great, It makes me feel awesome, that she cums everytime. But we always change into ON TOP position when we're done having pleasure or she just HAS to cum.. I want that to change, I want to make her orgasm in any other position BUT on top. Is it possible? (she says she's never had an orgasm in any other way, and she's never Masturbated)....

The problem is, that she doesnt like ME going down on her either, well, not coz I am not good. I've made another girl before her, cum, only using my tongue (on her clit), or only using my fingers (g-spot) and BOTH... So I know I can do it, everytime I go down on her, she just eventually pulls me back up and says she just wants my face to be where it belongs.. ON HER FACE :p.. But the thing is, she goes down on me frequently and I would like to return the favor, but she says for her, it doesn work like that.. So I WANT to make her come in any other position besides, ON TOP.
Give me any suggestions, any techniques, anything that can make it happen..
Ofcourse, we've tried many other positions and she says they're extremely pleasurable, but she just doesnt even get close to an orgasm, she just feels awesome. Now being a guy, whatever makes me feel awesome in sex, can make me cum, so I don't "GET" what she says.. :)

Help me, I would be totally indebted..
Position?, Movement?, Stroking?,
I am madly passionate about her and I really REALLY want to surprise her, by making her cum in any other position, besides, her on top..

Understand your frustration. For a change - my GF cums only if I go down on her. She likes few other things but could not cum.
Any way, keep trying but don't apply pressure on her. Things may change one day and if not...well - such is life.

I agree... Don't pressurize her... And yes, be positive, things'll change one day... My suggestion is, if she is happy with what is going on, let that continue for a while.. Sex has to be enjoyed by both and at present, it seems that both of you are enjoying it- only that you want to add some spice to it :). Good Luck buddy!

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Lets have sex, lets see how happy it makes;
Let us Kiss, my dear Miss;
You feel my dick and let me lick;
Let me suck your nipples, see how the Fun tripples;
Let me give you a hard fuck!!!!

If you read my first post I said I wanna SURPRISE her, by making HER cum in another Position. NO PRESSURE! (Either on me, or on her), Mr. Pearl is right, it's just something I wanna add to our Healthy (touchwood :p), Pleasurable, Sex Life..

We both most certainly enjoy each and every second of it and sometimes, mid-way she just tells me that "let me get on top" or "let me ride you" and within just a few seconds she's cumming her mind off.. But we still continue and she's still equally wet and "sexcited" for me to cum.. I still havent managed to give her a Multiple Orgasm, but I want to explore ALL of it with her eventually.. WITHOUT ANY PRESSURE to either of us.. We love what we do but it's only HUMAN to WANT MORE! :)